package com.cloud.common.core.utils;

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalUnit;
import java.util.Date;
import java.util.Objects;

/**
 * LocalDateTimeUtils is used to Java8中的时间类
 *
 * @author yan
 */
public class LocalDateTimeUtils {

    //获取当前时间的LocalDateTime对象
    //LocalDateTime.now();

    //根据年月日构建LocalDateTime
    //LocalDateTime.of();

    //比较日期先后
    //LocalDateTime.now().isBefore(),
    //LocalDateTime.now().isAfter(),

    //Date转换为LocalDateTime
    public static LocalDateTime convertDateToLDT(Date date) {
        return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
    }

    //LocalDateTime转换为Date
    public static Date convertLDTToDate(LocalDateTime time) {
        return Date.from(time.atZone(ZoneId.systemDefault()).toInstant());
    }


    //获取指定日期的毫秒
    public static Long getMilliByTime(LocalDateTime time) {
        return time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
    }

    //获取指定日期的秒
    public static Long getSecondsByTime(LocalDateTime time) {
        return time.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond();
    }

    //获取指定时间的指定格式
    public static String formatTime(LocalDateTime time, String pattern) {
        return time.format(DateTimeFormatter.ofPattern(pattern));
    }

    //获取当前时间的指定格式
    public static String formatNow(String pattern) {
        return formatTime(LocalDateTime.now(), pattern);
    }

    //日期加上一个数,根据field不同加不同值,field为ChronoUnit.*
    public static LocalDateTime plus(LocalDateTime time, long number, TemporalUnit field) {
        return time.plus(number, field);
    }

    //日期减去一个数,根据field不同减不同值,field参数为ChronoUnit.*
    public static LocalDateTime minu(LocalDateTime time, long number, TemporalUnit field) {
        return time.minus(number, field);
    }

    /**
     * 获取两个日期的差  field参数为ChronoUnit.*
     *
     * @param startTime
     * @param endTime
     * @param field     单位(年月日时分秒)
     * @return
     */
    public static long betweenTwoTime(LocalDateTime startTime, LocalDateTime endTime, ChronoUnit field) {
        Period period = Period.between(LocalDate.from(startTime), LocalDate.from(endTime));
        if (field == ChronoUnit.YEARS) return period.getYears();
        if (field == ChronoUnit.MONTHS) return period.getYears() * 12 + period.getMonths();
        return field.between(startTime, endTime);
    }

    //获取一天的开始时间，2017,7,22 00:00
    public static LocalDateTime getDayStart(LocalDateTime time) {
        return time.withHour(0)
                .withMinute(0)
                .withSecond(0)
                .withNano(0);
    }

    //获取一天的结束时间，2017,7,22 23:59:59.999999999
    public static LocalDateTime getDayEnd(LocalDateTime time) {
        return time.withHour(23)
                .withMinute(59)
                .withSecond(59)
                .withNano(999999999);
    }

    //获取一天的结束时间，2017,7,22 00:00
    public static LocalDateTime getDayStart(LocalDate date) {
        if (Objects.isNull(date)) {
            return null;
        }
        return date.atStartOfDay().withHour(0)
                .withMinute(0)
                .withSecond(0)
                .withNano(0);
    }

    //获取一天的结束时间，2017,7,22 23:59:59.999999999
    public static LocalDateTime getDayEnd(LocalDate date) {
        if (Objects.isNull(date)) {
            return null;
        }
        return date.atStartOfDay().withHour(23)
                .withMinute(59)
                .withSecond(59)
                .withNano(999999999);
    }

    //获取当前时间
    public static String getCurrentTime() {
        return formatTime(LocalDateTime.now(), "yyyy-MM-dd HH:mm:ss");
    }

    //格式LocalDate
    public static LocalDate fomartLocalDate(String localDate) {
        return LocalDate.parse(localDate, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    }

    /**
     * 计算天数 2019-11-17#2020-02-16 相差91天 未包括当天
     * 包括当天得 +1天 localdate类型
     *
     * @param beginTime
     * @param EndTime
     * @return
     */
    public static int betweenDays(String beginTime, String EndTime) {
        return (int) (LocalDate.parse(EndTime).toEpochDay() - LocalDate.parse(beginTime).toEpochDay());
    }

    /**
     * 计算天数 2019-11-17#2020-02-16 相差91天 未包括当天
     * 包括当天得 +1天 localdate类型
     *
     * @param beginTime
     * @param EndTime
     * @return
     */
    public static int betweenDays(LocalDate beginTime, LocalDate EndTime) {
        return (int) (EndTime.toEpochDay() - beginTime.toEpochDay());
    }

    /**
     * 将timestamp转为LocalDateTime
     *
     * @param timestamp
     * @return
     */
    public static LocalDateTime timestamToDatetime(long timestamp) {
        Instant instant = Instant.ofEpochMilli(timestamp);
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

}
